Datasheet

LT3497
2
3497f
ELECTRICAL CHARACTERISTICS
PACKAGE/ORDER INFORMATIONABSOLUTE MAXIMUM RATINGS
Input Voltage (VIN) ...................................................10V
SW1, SW2 Voltages ..................................................35V
CAP1, CAP2 Voltages ................................................35V
CTRL1, CTRL2 Voltages ............................................10V
LED1, LED2 Voltages ................................................35V
Operating Temperature Range ................. –40°C to 85°C
Maximum Junction Temperature .......................... 125°C
Storage Temperature Range ................... –65°C to 125°C
(Note 1)
PARAMETER CONDITIONS MIN TYP MAX UNITS
Minimum Operating Voltage 2.5 V
LED Current Sense Voltage (V
CAP1
– V
LED1
)V
CAP1
= 16V
190 200 210 mV
LED Current Sense Voltage (V
CAP2
– V
LED2
)V
CAP2
= 16V
190 200 210 mV
Offset Voltage (V
OS
) Between
(V
CAP1
– V
LED1
) – (V
CAP2
– V
LED2
) Voltages
V
OS
= |(V
CAP1
– V
LED1
) – (V
CAP2
– V
LED2
)| 0 2 8 mV
CAP1, LED1 Pin Bias Current V
CAP1
= 16V, V
LED1
= 16V 20 40 µA
CAP2, LED2 Pin Bias Current V
CAP2
= 16V, V
LED2
= 16V 20 40 µA
V
CAP1
, V
LED1
Common Mode Minimum Voltage 2.5 V
V
CAP2
, V
LED2
Common Mode Minimum Voltage 2.5 V
Supply Current V
CAP1
= V
CAP2
= 16V, V
LED1
= V
LED2
= 15V,
V
CTRL1
= V
CTRL2
= 3V
6 8.5 mA
V
CTRL1
= V
CTRL2
= 0V 12 18 µA
Switching Frequency 1.8 2.3 2.8 MHz
Maximum Duty Cycle 88 92 %
Converter 1 Switch Current Limit SW1
300 400 mA
Converter 2 Switch Current Limit SW2
300 400 mA
Converter 1 V
CESAT
I
SW1
= 200mA 200 mV
Converter 2 V
CESAT
I
SW2
= 200mA 200 mV
Switch 1 Leakage Current V
SW1
= 16V 0.1 5 µA
Switch 2 Leakage Current V
SW2
= 16V 0.1 5 µA
TOP VIEW
11
DDB PACKAGE
10-LEAD (3mm × 2mm) PLASTIC DFN
LED1
CTRL1
GND
CTRL2
LED2
CAP1
SW1
V
IN
SW2
CAP2
6
8
7
9
10
5
4
2
3
1
T
JMAX
= 125°C, θ
JA
= 76°C/W, θ
JC
= 13.5°C/W
EXPOSED PAD (PIN 11) IS GND, MUST BE SOLDERED TO PCB
ORDER PART NUMBER DDB PART MARKING
LT3497EDDB LCGT
Order Options Tape and Reel: Add #TR
Lead Free: Add #PBF Lead Free Tape and Reel: Add #TRPBF
Lead Free Part Marking: http://www.linear.com/leadfree/
Consult LTC Marketing for parts specifi ed with wider operating temperature ranges.
The denotes the specifi cations which apply over the full operating
temperature range, otherwise specifi cations are at T
A
= 25°C. V
IN
= 3V, V
CTRL1
= V
CTRL2
= 3V.